JP2007513557A5 - - Google Patents

Claims (24)

A controller for an adaptive FEC encoder using a codeword composition ratio (CCR), wherein the CCR is a quantity or value representing the relationship between the number of payload bytes and the number of parity bytes in an applicable FEC encoding scheme, Furthermore , the FEC encoder is used in a DSL system in which a transmitter transmits data over a channel to a receiver using FEC encoding, interleaving, original net data rate, and original transmission latency;
A data module configured to obtain a measured transmission error value (MEV), which is a measured data value representing a transmission error in the DSL system, and coupled to the DSL system ;
An analysis module configured to analyze the MEV with respect to a target transmission error value (TEV), which is a target data value for a transmission error in the DSL system, and coupled to the data module;
Further, it is configured to repeatedly determine any adjustments to the CCR that are required to achieve adjusted FEC encoding to achieve the TEV using historical performance data of the DSL system. The analysis module
Furthermore, based on any adjustment to the CCR to achieve the adjusted FEC encoding to achieve the TEV, any arbitrary to the transmitter interleave required to preserve the original transmission latency The analysis module configured to determine an adjustment ;
For the DSL system,
Any adjustment to the CCR determined by the analysis module to achieve FEC encoding adjusted to achieve the TEV;
Any adjustment to the transmitter interleaving determined by the analysis module to preserve the original transmission latency;
A control signal generator configured to generate a control signal instructing to implement and coupled to the analysis module ;
A control device comprising: The control device according to claim 1, wherein the adjustment to the CCR is realized using at least one of an impulse noise protection value or INP. The control device according to claim 1, wherein the adjustment to the CCR is realized using at least one of parameters N, K, R, or S. 4. The control device according to claim 3, wherein the adjustment to the transmitter interleaving to maintain the original transmission latency is realized using at least one of parameters S or D. The MEV has a bit error rate, errored seconds, errored fractions, number of code violations in a fixed period,
The control device according to claim 1, wherein the control device is based on at least one of a signal-to-noise ratio measured at the receiver or a TCP / IP throughput. The control device according to claim 1, wherein the data module, the analysis module, and the control signal generator are realized as at least one of computer-readable program code or hardware.   The control device according to claim 1, wherein the TEV is a threshold error rate limit. The control device of claim 1, further comprising a history data module coupled to the analysis module .   The control device according to claim 8, wherein the history data module is a database.   The controller of claim 1, wherein the controller comprises a dynamic spectrum manager. Receiving an input signal the data module represents the MEV, control apparatus according to claim 1. A method for coordinating FEC encoding in a DSL system in which data is transmitted between a transmitter and a receiver over a channel, wherein the DSL system further includes FEC encoding, interleaving, original net data rate, and original Use the transmission latency of
Selecting a CCR representing the relationship between the number of payload bytes and the number of parity bytes in (a) FEC coding scheme,
(B) the CCR, the FEC coding scheme, the original net data transfer rate, and with the original transmission latency, and transmitting the data through the channel,
Acquiring (c) MEV,
(D) comparing the MEV with a TEV comprising evaluating historical data regarding previous transmissions on the channel;
(E) a step of the MEV to adjust the CCR to adjust the FEC coding when the TEV and sufficiently large different,
(F) based on the adjustment to the CCR, evaluating whether an adjustment to the transmitter interleaving is required to maintain the original transmission latency;
(G) if necessary, realizing the adjustments required to maintain the original transmission latency and repeating steps (b) to (g);
With a method. Obtaining the MEV comprises at least one of directly measuring characteristics of the communication system, collecting values from an element management system, or calculating the MEV from collected data. The method according to claim 12 . The method of claim 12 , wherein the method is performed by a controller. The method of claim 12 , wherein the communication system is a DSL system and the method is performed by a controller. Wherein the controller is a dynamic spectrum manager, present in the CO, exist outside the CO, the is an operator of the DSL system, or is also independent of any operator of the DSL system, according to claim 15 The method described in 1. The method of claim 12 , wherein the CCR is K / N. The method of claim 12, wherein the adjustment to the CCR is realized using at least one of an impulse noise protection value or INP. The method of claim 12, wherein the adjustment to the CCR is realized using at least one of N, K, R, or S. 20. The method of claim 19, wherein the adjustment to the transmitter interleaving to preserve the original transmission latency is achieved using at least one of parameters S or D. The MEV is bit error rate, error seconds, the error fraction, code violation count in the fixed period, the measured signal-to-noise ratio at the receiver, or based on at least one of the TCP / IP throughput in claim 12 The method described. The method according to claim 12 , wherein steps (b) to (g) are implemented by computer readable program code. The method according to claim 12, wherein steps (b) to (g) are implemented by hardware. A transmission channel;
A transmitter coupled to the transmission channel;
An adaptive FEC encoder coupled to the transmitter;
A receiver / combiner coupled to the transmission channel;
A transmission error value monitoring device coupled to the receiver / combiner, comprising a bit error rate, errored seconds, error fractions, number of code violations in a fixed period, signal-to-noise measured by the receiver / combiner ratios, and monitors the transmission error value based on at least one of the group consisting of TCP / IP throughput, and transmission error value monitor apparatus that operates to make generate an input signal,
The controller of claim 1 combined with the adaptive FEC encoder;
A transmission system equipped with.